Mariah Carey teams up with Miguel and Queens of the Stone Age collaborate with Dave Grohl for new singles released to iTunes within the past week - plus there's the latest from Summerfest headliner Empire of the Sun. Hear the songs and read our takes below.

Mariah Carey
Single: “#Beautiful”
Gut reaction: From recruiting R&B artist of the hour Miguel to tossing in a Twitter-friendly hashtag in the title, a good amount of thought was given to make sure Mimi’s latest reached maximum exposure. Too bad more thought wasn’t given towards the song itself. The voices are “#beautiful,” no surprise there, but the music itself is “#boring.” Grade: C-

Queens of the Stone Age
Single: “My God is the Sun”
Gut reaction: Starting off like early Foo Fighters (Dave Grohl contributed drums on the forthcoming album), “Sun” appears to settle into a crunchy guitar rock…until the ambition’s elevated by a surprise Gregorian chant cameo, and later on, a tipsy, bluesy breakdown. Grade: B